Some time ago there was start of story where MC was abandoned by his mom after birth. After years he finally located her, as her other, younger son destroyed MC's marriage. As former secret agent, he swore some revenge.....Does anyone knows story's title and status?
https://storiesonline.net/n/39882/brute
I wouldn't get my hopes up in terms of updates, though. If you look at what the author posted (across the board, not just this one story), it really seems like they're one of those writers who got into reading Cheating Wife Stories, wanted to add their own, then put a bunch of clichés on paper over the span of two weeks,... and then lost interest.
Luckily, on SOL at least, the site encourages other authors to 'finish' any long-abandoned story, rather than leaving readers forever frustrated. Though, it's always best to at least acknowledge with story/author too took your inspiration from, as that way, legally, you're 'sharing the wealth' by promoting the original author's work, which is the whole legal basis of fan-fiction, as supposedly, everyone profits from it.